Re: [OpenSTA-devel] Re: When is Random not random?

[Mark E. <ma...@bo...>]

Wickersham, Peter wrote:
> 
> In fact, there already is an issue with this code for REPEATABLE RANDOM
> and that is the fact that we are using rand() in the first place. This
> is a global function and the seed is a global, as well. So, if you want
> more than one REPEATABLE RANDOM sequence, this won't work.

I see what you mean, but if the two lines
srand (_cur_seed);
_cur_seed = rand();
were an atomic operation, wouldn't that take care of the problem as far 
as repeatable random is concerned?

Then the #define VOREPRAND could be checked for in _options as to 
whether repeatable or otherwise (no srand() call) should be used.

Or have I missed something obvious?

Mark